Virtual private network is defined as customer connectivity deployed on a shared infrastructure with the same policies as a private network. The shared infrastructure can leverage a service provider IP, Frame Relay, or ATM backbone, or the Internet. Currently there are no standards outlining the software and hardware components of a VPN. Every vendor that provides a VPN service performs it in a method that is best supported by its own hardware platforms and software applications. This chapter provides an overview of building VPNs using the Layer 2 Tunneling Protocol (L2TP), and it explores the possible implementation topologies.
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